/Engine/Source/Runtime/Engine/Classes/GameFramework/PlayerController.h
Performs a collision query under the finger, looking on a trace channel
bool GetHitResultUnderFingerByChannel ( [ETouchIndex::Type](API\Runtime\InputCore\ETouchIndex__Type) FingerIndex, ETraceTypeQuery TraceChannel, bool bTraceComplex, [FHitResult](API\Runtime\Engine\Engine\FHitResult) & HitResult ) const